If you’re a stock market junkie or perhaps even just a mildly active investor, you probably know. But if you shy away from 401(k) statements or sidestep making decisions about savings plans, you might not. And that might not be a wise thing these days.

The stock market has been on a tear lately, setting new records here and there and generally advancing well beyond the market troughs of the mid-2000s. When that happens worries begin to surface about whether or not the stock market will correct and give back some of its gains.

That, obviously, would affect all investors. But it is particularly concerning for those people approaching retirement and expecting their stock portfolios to help support them through the Golden Years. Younger investors have time to recover from market losses; older investors, not so much.

That’s why most financial advisors and professionals preach the wisdom of diversification, the investment equivalent of not putting all your eggs in one basket. Although there are no guarantees, spreading investments out over a variety of vehicles in addition to stocks ̶ like bonds, commodities, real estate, and, yes, even insurance and annuities (admittedly MassMutual products) – can help preserve value in a portfolio should the equity markets take a tumble.

Then again, when one market takes off, investments in other areas may limit a portfolio’s advance. Indeed, in any advancing market there will be pundits saying a correction may come there and others saying the gains will likely continue and investors shouldn’t miss out. No one can be sure and for each individual investor the question revolves around how much risk he or she is willing to accept.

This is where asset allocation comes into play. The proper mix of investments – stocks, bonds, and other areas – will not be the same from investor to investor. An older investor may want more of his or her portfolio in less volatile investments in order to safeguard retirement savings. Those investors with a longer time horizon may be willing to accept a little more volatility and risk in exchange for the possibility of greater gains over time. And some investors may opt for ground in-between, putting a portion of their money into risky areas while channeling some into more stable markets and vehicles that will build steady value over time.

The investment mix within a portfolio – the asset allocation – will differ from person to person and depend on factors like his or her time horizon, financial circumstances, goals, and personal disposition toward risk and reward. Depending on the situation or complexity, some people opt to consult a financial advisor or other professional to review their asset allocation and investment mix.

The information provided is not written or intended as specific tax or legal advice. MassMutual, its employees and representatives are not authorized to give tax or legal advice. You are encouraged to seek advice from your own tax or legal counsel. Opinions expressed by those interviewed are their own, and do not necessarily represent the views of Massachusetts Mutual Life Insurance Company.

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